Google Play Store carrier billing support added for Boost Mobile in the US
Since Boost Mobile is a prepaid network operator, it's kind of a surprise that it now supports Google Play Store carrier billing, which is usually supported by postpaid carriers. Nevertheless, the more options customers have at their disposal, the better the service becomes.
If you're a Boost Mobile customers, you can now start setting up direct carrier billing in the Google Play Store application. For those unaware, carrier billing support means that you don't have to own a debit or credit card in order to pay for things you buy on Google Play Store.
source: Google Support via AndroidPolice
Things that are NOT allowed: